Sucking out the oil

Did a oil service on a V10 Touareg this weekend and it's recommended to suck the 13 litres of oil out via the dip stick and that's how we did it.

This can't be the best way of removing the oil from the sump can it?
Surly there will always be half a litre of old, sludgy oil at the bottom and over time that will just get worse, thicker and sludgier?

What is people's view on oil changes via sucking?
Any evidence to say its a bad thing or its better?

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